<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    p {
      font-size: 36px;
    }
    h2{
      font-size: 16px;
    }
  </style>
</head>
<body>
  <h2>嘻嘻</h2>
    <div>我的字体是正常的</div>
    <p>我的字体大两倍</p>
</body>
</html>